History After 1820 Religious reform headlined the 1820's as three popular beliefs, Deism, Unitarianism, and Universalism gave an impact on American society. Deism simply stated that one must explore the universe to understand it. Unitarianism, which was supported by William Ellery Channing, was a belief that emphasized the oneness and benevolence of God. Like Unitarianism, Universalism attracted people to God, but it supported the belief that God would not send anyone to an eternal life of Hell, that he could eventually have everyone in his harmony. These beliefs helped jumpstart the Second Gre